Earl's MulTfill is a ready to use fine filler that can be used both on interior and exterior applications. MulTfill will not shrink, sink or fall out and once dry, sands extremely easily. Earl's MulTfill can be used on brick, plasterboard, wood, plywood, concrete, cement sheets and more.Most importantly MulTfill takes almost all known coatings, has a long shelf life of 5 years and contains no volatile compounds